From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761520AbZE0Hiq (ORCPT ); Wed, 27 May 2009 03:38:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763807AbZE0Hhd (ORCPT ); Wed, 27 May 2009 03:37:33 -0400 Received: from claw.goop.org ([74.207.240.146]:41614 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763835AbZE0Hhb (ORCPT ); Wed, 27 May 2009 03:37:31 -0400 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: the arch/x86 maintainers , Linux Kernel Mailing List , Xen-devel , Greg KH , Jens Axboe , Chris Wright , kurt.hackel@oracle.com, Andrew Morton , Ky Srinivasan , Beulich , Linus Torvalds , Avi Kivity , Jeremy Fitzhardinge , Jeremy Fitzhardinge Subject: [PATCH 04/17] xen: create dummy ioapic mapping Date: Wed, 27 May 2009 00:37:17 -0700 Message-Id: <1243409850-21577-5-git-send-email-jeremy@goop.org> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1243409850-21577-1-git-send-email-jeremy@goop.org> References: <1243409850-21577-1-git-send-email-jeremy@goop.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We don't allow direct access to the IO apic, so make sure that any request to map it just "maps" non-present pages. We should see any attempts at direct access explode nicely. [ Impact: debuggability (make failures obvious) ] Signed-off-by: Jeremy Fitzhardinge --- arch/x86/xen/mmu.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 331e52d..139c8de 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1919,6 +1919,16 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) pte = pfn_pte(phys, prot); break; +#ifdef CONFIG_X86_IO_APIC + case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END: + /* + * We just don't map the IO APIC - all access is via + * hypercalls. Keep the address in the pte for reference. + */ + pte = pfn_pte(phys, PAGE_NONE); + break; +#endif + case FIX_PARAVIRT_BOOTMAP: /* This is an MFN, but it isn't an IO mapping from the IO domain */ -- 1.6.0.6